Auto Exposure Lock (sometimes called AEL) is a feature on all Canon EOS camera models, as well as some PowerShot cameras. It's an excellent method of gaining added control over exposure, without losing the speed and convenience of automation.

With the new advances that specifically target the professional video user, this new firmware upgrade for the EOS 5D Mark II transforms some aspects of the camera and further enhances its status as the HD-SLR of choice.